Magic Lantern API docs
Magic Lantern for 5D Mark II 2.0.4
Magic Lantern for 550D 1.0.8
These docs were generated with Doxygen, after a bit of Doxyfile tweaking. You can find my Doxyfile here.
Magic Lantern State Diagrams
See here
Disassembler test
Disassembly of Magic Lantern firmware: Quick and Full.